William Edson Jessop (born William Edson Timpson) is a leader in the Mormon fundamentalist movement. In a January 2007 telephone conversation between Jessop and church president Warren Jeffs, Jeffs suggested that Jessop was the rightful leader of the Fundamentalist Church of Jesus Christ of Latter-Day Saints (FLDS Church). In a jailhouse visit with his brother Nephi, Jeffs reportedly stated that "Brother William E. Jessop has been the prophet" of the FLDS Church since the death of Rulon Jeffs.